Abstract
The phase diagrams of the ACl/YbCl 3 (A=Cs,Rb,K) systems were investigated by DTA and XRD. Compounds A 3YbCl 6, A 2YbCl 5 and AYb 2Cl 7 exist in all systems, enneachlorides A 3Yb 2Cl 9 in the systems with A=Cs,K. In the group AYb 2Cl 7, the Yb ions have coordination number 7, in all other compounds the coordination is octahedral. Thermodynamic functions determined by solution calorimetry and emf vs T measurements in galvanic cells for solid electrolytes reveal that the ternary chlorides A n YbCl 3+ n are stable compared with mixtures ( nACl+YbCl 3); the compounds Cs 2YbCl 5 and Rb 2YbCl 5 are stable only at temperatures >0 K.
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